This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...be foun that in general the spark should occur at a Figure 73.--Rlpht: Breaker of Single-Cylinder Magneto. Center: Breaker of Twin-Cylinder V-Typc Magneto. Left: Breaker of Twin-Cylinder Horizontally Opposed Magneto (Bosch). point in the stroke from one-quarter to five-eighths of an inch from top dead center. The only ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...be foun that in general the spark should occur at a Figure 73.--Rlpht: Breaker of Single-Cylinder Magneto. Center: Breaker of Twin-Cylinder V-Typc Magneto. Left: Breaker of Twin-Cylinder Horizontally Opposed Magneto (Bosch). point in the stroke from one-quarter to five-eighths of an inch from top dead center. The only care required by the magneto is the oiling of the bearings, each of which should be given not more than four or five drops every five hundred miles. The breaker lever is intended to operate without lubrication. Oil on the points will prevent good contact and will cause sparking and burning as well as an engine miss, therefore, great care should be exercised to prevent the entrance of oil to these parts. The correct gap between the breaker contacts when separated is.014 of an inch. Dixie Magnetos.--The principle of operation may be understood by reference to Figure 74. The magneto consists, in its principal parts, of a set of magnets, a rotating member, a special field structure carrying the coils, the coil windings, a breaker, and a condenser. Tho rotating member, or rotor, consists of two revolving wings N and S, shown at 1 in the illustration, whieli are separated by a bronze center piece. These wings are carried by the magneto drive shaft and revolve between the poles of the magnets, one rotor revolving adjacent to the North pole while the other revolves close to the South pole. Because each rotor always revolves close to its own pole of the magnets it always maintains the same magnetic polarity, one always being positive while the other is always negative. Again viewing a section of the magneto and looking across the magnets as in 2, 3 and 4 of Figure 74, in place of through the arch as in 1. it will be seen that the rotor is enclosed by t...
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